as far as I know, pwede ka mag benta ng account dito sa forum as long as hindi sya illegally obtained(i.e. hacked or scammed account, etc...). fair warning lang na baka may mga members na may mag negative tag sayo for selling Twitter accounts to the bounty hunters. although there is no guarantee na ma bibigyan ka ng negative there is also a possibility that you might.
You are only allowed to sell accounts/invites that you legally obtained yourself or through legitimate trades. If you did anything illegal in order to obtain an item, then you can't trade it on bitcointalk.org. Anyone found breaking this rule will be banned.