“exfm is the best way to find and share music online.” You can also see the top, most loved songs that are trending, which are updated on a daily basis. There are really too many advanced features to name, but one of the best is the continuous music play, even after you close a tab.

exfm includes integration with Facebook, Twitter, Tumblr, and Last.fm so that you can connect with friends, share what you’re listening to, and scrobble your plays (Last.fm).

There are also mobile apps available for iOS and Android, as well as a Chrome extension.

Another service where you get to listen to unlimited music, discover new music, and share with friends.

You can connect your Facebook account in order to find and connect with your Facebook friends. You can also enable Last.fm scrobbling in settings so that whatever you listen to on MOG is automatically shared to Last.fm.

Songs that you listen to can be shared on Facebook, Twitter, and via direct link. MOG also has mobile apps for iOS and Android.

As the “world’s largest international community of music lovers,” Grooveshark is a great place for finding new music, creating playlists, connecting with other music lovers, and sharing music across the Web.

You can also see what other people think about your favorite songs. You can also enjoy and share music on your smartphone with mobile apps for iPhone (jailbroken only), Android, BlackBerry, and more.

Cantio is a beautifully designed web-based app that lets you “browse millions of tracks, find your favorite artists and songs, create playlists, share them with your friends and family and much, much more”.

Additionally, you can connect your Last.fm account to enable scrobbling and change the quality of the music from average to good (720p HD).

Songs can be shared on Facebook, Twitter, and via direct link.

The self-proclaimed “Internet radio made social” is a great place to listen to free music and share it on various social sites like Facebook, Twitter, Tumblr, LiveJournal, and more.

You’ll get access to millions of free songs and videos and can even add your own songs.

You’ll need to connect your services in settings so that your ‘blips’ will be automatically shared on your favorite social sites.

As one of the dominant music recommendation services, Last.fm lets you create radio stations and discover music based on the songs you play.

Their infamous Scrobbler is a tool that you can download to your computer that then lets the world know about each song that you listen to, while paying attention to the songs you ‘love’.

Along with the Scrobbler, there are mobile apps for the iPhone and Android that let you share music from your smartphones.

Search for favorite songs and artists, create playlists, and share with your friends on Facebook, Twitter, email, and more.

Connect with other users to see what they’re listening to and also discover new music.

With this free Internet player, you can discover new music based on artists that you like. Much like Pandora, Jango shows you similar songs and artists that match your taste; you can also customize your stations by adding more artists and rating songs.

Music can be shared on Facebook, Twitter, and via email. For sharing on the go, check out the iOS and Android mobile apps.

I’m sure you’re already familiar with Pandora, the Internet radio that lets you create stations based on your favorite songs and artists. You can further customize your stations with a thumbs up or thumbs down, along with adding other artists to your stations that you want to hear in the mix.

Pandora is tightly integrated with Facebook and Twitter for sharing. There are also mobile apps for iOS, Android, and BlackBerry.

YouTube doesn’t need much of an explanation. The popular video sharing site lets you share videos with family, friends, and the entire world.

You can also create playlists, add videos to favorites, and of course share on all of your social networks. If you connect your Facebook, Twitter, and Orkut accounts you can automatically share your YouTube activity on those accounts; this is an easy way to share your likes and favorites on the Web. YouTube, of course, has mobile apps and a mobile website.

Although there is currently a waiting list for Twiturm, it sounds promising. The website states that you’ll be able to "share your music on Facebook, Twitter, and 30 other social networks, blogs, and micro sites."

This social music discovery service is a partner of MySpace and also the dominant music application on Facebook and Google platforms. Through their social apps (like the one for Facebook) you’re able to share what you’re listening to on various social networks.

There’s also the iLike Sidebar that lets you share your playlists on Facebook and any other Web page.

With this awesome Chrome extension you can discover music anywhere by searching for artists within the extension or on the Web.

For instance, when you go to Facebook fan pages you’ll see both 'play’ and 'plus’ buttons next to the artists’ names. This lets you play your favorite artists in the background or add them to a playlist. You can then share what you’re listening to on Facebook and Twitter.

"Turntable connects you, your friends and others in a real-time music listening experience."

You get to be a DJ and play songs for everyone in the room. They can then vote on the songs you play and reward you with DJ points.

Songs that you play can be shared on Facebook, Twitter, via email, or direct link. Turntable also has an iOS app.

SoundClick is just more than sharing music, you can also upload voice clips and other moments to share with friends and on your favorite social networks.

They also have an App Gallery with over a hundred apps for your desktop, the web, and mobile devices.

What kind of mood are you in? Musicovery lets you define the mood of your radio station by rolling your mouse over the mood pad.

Stations can be further customized based on the type of music genre you want to hear. If you prefer, you can create stations based on specific artists. Either way, whatever you listen to can be shared on Facebook and Twitter.

Have you ever noticed the #nowplaying hashtag on Twitter?

Some people manually add it to their tweets, while others use apps like Twusic to share what they’re listening to. All you have to do is tweet the song you’re listening to and the artist’s name together with the #nowplaying hashtag.

Alternately, you can search for music on the site and then tweet it directly from that page. The main benefit of using Twusic is that you can create playlists so that you’re music is all in one place. You can also see what your friends are listening to.

Just sign into Tunebirds with your Twitter account and then you can share songs and playlists that you create on Twitter.

Pretty simple.

Crunch.fm is another simple Twitter music sharing tool that lets you search for songs and artists, and then lets you share them along with the #nowplaying hashtag.

It doesn’t get much easier than Tinysong (created by Grooveshark); you can share any song just by searching and then clicking on the 'share’ button next to the song you want to share.

Songs can be shared on Twitter, Facebook, Tumblr, StumbleUpon, email, or via direct link.

Song.ly is very much like Tinysong, Crunch.fm, and Tunebirds: you can type in a song title or paste an mp3 link to share on Twitter.

Once again, the #nowplaying hashtag is also included along with a #song_ly hashtag.

Serendip is another Web app in which you’ll need an invite in order to access it.

The website states that you’ll get a "personalized music experience, provided by the people you listen to". It looks to be tightly knitted with Twitter for flawless music sharing.

If you currently use or have used Firefox in the past, you’re probably familiar with the popular FoxyTunes Addon, which lets you control your music player from within Firefox.

TwittyTunes is a feature that you can add to FoxyTunes, which lets you share the song you’re currently listening to on Twitter, Facebook, Last.fm, Yahoo Messenger, and Skype with a single click.

Vevo is pretty much like YouTube and doesn’t need much of an explanation. It’s is great for finding and sharing videos on Facebook, Twitter, and Google+.

A unique feature that Vevo includes is a QR code so that you can san the item to your mobile device. They also have mobile apps for iPad, iPhone, Android, Windows Phone, and BlackBerry PlayBook.

Lastly we have GetGlue, which is most known as a place to check-in to TV shows and movies that you’re watching, but it’s also great for checking into music that you’re listening to.

You can use one of the mobile apps or the web-based version to share what artist you’re listening to on Facebook, Twitter, and Tumblr in order to earn points and stickers.