A lot of time when I read articles there are mainly just few sentences I think are important/relevant/funny etc that I really want my friends to see. However I have to just tweet the whole article, and chances are people won't see what I intended. Are there any companies currently working on a solution to this?
Yah, but I stopped development it... ScreenRack. Save snippets by highlighting text, archiving full articles and capturing screenshots of the original articles, etc.
Mobile / web app. Think Instapaper + Historious.
http://screenrack.com/
If there's interest, I'll push forward again.