Hollywood big shots Michael De Luca and Dana Brunetti , who produced movies shot around Boston such as “The Social Network,” “Moneyball,” and the yet-to-be-released Tom Hanks drama “Captain Phillips,” have signed on to helm an adaptation of E.L. James ’s “Fifty Shades of Grey.” That doesn’t mean that the erotic movie will be shot in Boston, but . . . perhaps? After all, Boston can look just as dreary as Seattle, where the trilogy takes place, and De Luca and Brunetti obviously know about Massachusetts tax incentives for filmmakers.