When it comes to google maps, gmail, and internet browsing, the mytouch slide (MTS) will be best suited for this as all the google based services are integrated into the underlying android architecture.
Facebook will be a little bit better on the MTS as there are apps on android that let you integrate it directly with your contacts, etc.
However, BBM is unique to blackberries and the closest you would ever get to it would be AIM or some other third party instant messenger program.
Personally, I was stuck between an android device and a blackberry but chose the BB in the end because I don't do too much of the social networking thing but BBM and email is quite important while I am on the job.
I would suggest just playing with display models or trying them out for a few days to see how it suits you.
9530 v18.104.22.1689-took a dive into oil...
8520 v22.214.171.1241-in the box
8100 - 126.96.36.199-out of retirement? lol