Is the informal recruitment a more structured one (i.e. all the sororities participate) or is it just a few sororities rushing to try to get their numbers up?
If it's the former, I would definitely say go for it!!!
If it's the latter, I would see if you can find someone on here that goes to your school (use the search function) and ask what they think - if that would hurt your chances later. This really varies school by school and you're on the ball to be wary of jumping right into it.
You might also want to ask them how hard it is for a sophomore to get a bid as opposed to a freshman. Depending on the school, informal might be the only game in town for you.
Good luck!
