README: describe what tweeper is in a more generic way

Since tweeper does not support only Twitter.com but also other social
websites, give a more general idea of what it can be used for.

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-Tweeper is a web scraper which extracts the most recent public tweets of
-a given user from their home page on Twitter.com and formats them in RSS, so
-the information can be conveniently accessed and collected by a feed reader.
+Tweeper is a web scraper which can be used to conveniently follow the public
+activity of social network users without the need to log in or even be
+subscribed to the social network; tweeper converts the public information to
+RSS so that it can be accessed and collected by a feed reader.
 
 Since Jun 11th 2013 Twitter.com retired their API v1.0, so it's not possible
 to access a user timeline via RSS anymore, and it's also become mandatory to