Yeah... it's a matter of scale.

Twitter has 20 employees, a cash burn rate of $5m a year according to the article.

Facebook has hundreds of employees and servers... probably a lot harder to make a profit.

comparing apples and oranges. google has way more expenses than the coffee shop next door, but that doesn't mean it's harder for google to earn a profit.

my personal opinion is that facebook users on the whole are a lot more engaged than twitter users. i know an awful lot of folks on twitter who use it as a broadcast medium rather than a place for conversation and connection. facebook seems to be a place where people actually connect with each other more. granted, this is all anecdotal.

Last numbers I heard for FB were 800+ employees, and 10,000+ servers. Both just a tad excessive, although I guess you have to spend the VC money somehow.