You can get the 'gotta' blog moodlet 3 times on the one sim. Make them your friend first, then good friend, and then best friend. If you keep summoning snobs, getting to BF will be very quick, at least until you unlock the option with the relationship transmogrifier. You could probably even go for more with romantic as well, but that will likely affect your reputation.
EDIT: You can use the same sim over and over, actually. Change their relationship down one level, and then change it back up one. When it goes back up one, you get the 'gotta blog' moodlet again. It's 6am Friday morning of week 1, and my sim has just sold his first personal blog for over §6000! And that was before I latched onto the trick totally, and was relying on talking to sims to make them friends. Additionally, without having used a wish enhancing serum, or completing his LTW, he has over 60,000 LTH, mostly to do with social networking wishes.
I haven't done the other two types of blog yet, but my guess at this point would be a) use a witch to transform items into gems and metals b) an anger for fish c) buy gems and metals from the consignment stores.
For the review one, make a children's book writer, and read and review your own books.
EDIT: It's worth mentioning that the 'blogged out' moodlet happens by chance, not by how many times you blog. The higher your social networking skill, the less likely you are to get blogged out.
EDIT: I just made it to a five star personal blog again by 10pm Saturday - and my sim still spent some time fulfilling wishes also, and got blogged out twice. There is a 40% chance of recieving a buyout offer in the mail.