Would you like me to tell you what kind of bloggers write the longest posts? My qualified guess is – movie buffs. With posts titled “hellfaucet’s guide to movies that you should see” and “1001 films” [Edit: post seems to have been deleted] they share their opinions on just about every movie ever made, preferably with lots of screen shots mixed into the whole thing. Other extensive examples here, here and here. Only problem is when your company almost share its name with a famous movie director, your media/blog monitoring becomes a task well in line with finding a needle in a haystack.
Also see B.L. Ochman’s arguments against full text in RSS feeds. Or Constantin Basturea’s arguments for.