Yaoi, shotacon and male pregnancy fan-fiction all the way!
Well, Minako would definitely be a social busybody with a modern cellphone, tweeting, blogging, Facebooking and following the various celebrity scenes, and I don't consider Usagi as being much different, if only by a matter of a degree or two here or there. I'm not sure if she'd really devote herself to an MMORPG, though, since it'd really cut into her relations with her friends (the other sailor senshi, I mean), since most of them wouldn't have the same interest. Although, if they had an MMORPG of the sailor senshi, I can see them all playing it out of general amusement, some after a bit of convincing.
If Mamoru were to attend a college/university (I don't know the difference) that separates them to the extent that they can't visit each other physically, I don't think that she'd bother him overly much with texts and such. She seemed fairly mature about sending him letters when she thought he was in America, so, aside from times when a particular mood strikes her (because we know it will), steady E-mail and phone calls will probably be preferred to texting and chatting. I think so, anyway.