Foamee

http://foamee.com/

Helps you track whom you owe a beer to.

Wibiya

http://www.wibiya.com/

Wibiya features:

• Create a blog community using Facebook Connect
• Gain traffic from Facebook through your members news feed
• Engage readers and raise pageviews with applications such as post navigator and blog search
• Track your traffic growth through simple analytics tools
• Share your tweets with your readers in real time

Tiny Petition

http://tinypetition.com/

Start & sign petitions that make a difference with Twitter.

Proxifeed

http://www.proxifeed.com/

Proxifeed creates and broadcasts automated postings into your Twitter feed.

Use keywords that match your areas of interest and let Proxifeed identify relevant real-time web content. Mix-in other RSSsources too. See your feed become exciting and engaging. More and more people will notice and start following you.

Tweet Blocker

http://tweetblocker.com/

Use TweetBlocker to remove spam from your account. Developer API available.

Screenr

http://screenr.com/

Now you can create screencasts for your followers as easily as you tweet. Just click the record button and you’ll have your ready-to-tweet screencast in seconds:

• Web-based recorder-nothing to download.
• Record on your Mac or PC.
• Plays everywhere on the web, even iPhones.
• Start now – It’s completely FREE.

Brownosr

http://www.brownosr.com

Brownosr is a sophisticated engine capable of identifying brownosing activities on twitter.

HashLove

http://hashlove.com

HashLove allows you to send funny and sentimental birthday e-cards to people via Twitter. Soon they’ll have additional occasions and customizable cards.

Each card is given a permanent URL (ex. http://hashlove.com/cards/12) and a unique hashtag (ex. #guykawasakibday). People can then comment, tweet or RT and all those messages are aggregated on the card for the recipient.

Newsider

http://newsider.com/

Newsider is a news sharing site for twitter users. Twitter users can login with twitter and share news with their friends.

Newsider shares also 50% of its Adsense revenues with their users.

Newsider uses twitter OAuth and does not ask twitter users for their username and password.

Twivert

http://www.twivert.com

Twivert is an ad network for the popular micro-blogging platform twitter.com. 
Twitter users referred to as twitterers are provided with ‘value ads’ which they can share with their followers through twitter, for every genuine click on the ad, the twitterer gets paid. 
Twitterers have the control of posting ads that are appropriate to them and the maximum number of ads posted per day cannot exceed three, this prevents the user’s timeline from being flooded with ads.
Advertisers have the flexibility of targeting their ads at specific countries.
On the whole, using twivert advertisers can start up CPC campaigns while twitterers can display ads as part of their updates.