Twitter (!)... Can someone tell me what it is about and what people are looking for there?

[Pat]

Basically it's for posting small updates. Larger updates would generally be destined to blogs and other things like that.

You can send public messages to people by putting their name after the @ symbol in the message (i.e. "Hello @myfriend!")

You can also join a trend by using a hashtag. For example "Last night was so much fun! #FunOnSaturdays" would cause the message to be added to the #FunOnSaturdays trend, with other messages bearing the tag.

Twitter uses a very simple API for accessing it from other websites and applications. You just need to send data to a designated URL and it will return the information you need. You can find the documentation here: https://dev.twitter.com/docs