But, they still have to follow you.
> Receive direct messages from users without having them to litter into your timeline
It doesn't litter my timeline. In fact, I've never seen a direct message on my timeline. It gets emailed to me, and shows up in the "Direct messages" tab.
> Decide who you want to receive direct messages from
Don't I do this already by just not following them?
Not seeing a use for it, sorry.
They don't have to follow _you_. They do have to follow @dmpp. (I think this may be what you said. "You" seemed ambiguous. Sorry.)
No, direct messages are not in your timeline, but if you want to direct message someone, the rest of their tweets will have to be in your timeline. Using this service, you could direct message some people without following them, hence their tweets not littering your timeline.
Yes, you do decide who you receive direct messages from already. In context, that sentence meant "now that you've opened yourself up to direct messages from people you are not following, we do actually offer some level of control over what direct messages you receive."
I haven't decided yet whether this is useful to me personally or not. Nonetheless, I find it clever.
"U can now receive DMs from people you have @replied sometime, even tho' you dont follow them anymore."
The above represents the default behavior, however, U could modify access to be able to receive DM from anybody/only followers
You might find it useful personally, if you look at it this way:
"You will now be able to receive DMs from people you have @replied some time, irrespective of whether you are now following them"
No. If they ever @replied to U, U can DM them. (default behavior)
If you follow someone, so that they may be able to DM U (say @rememberthemilk), your timeline now includes their tweets, which U may not want.
Nope. Twitter decides this for U. U can now only receive DMs from people you follow. By following this, you could beat this restriction and define your own restriction. The default restriction we use is people you have @replied can send U DMs.
You are free to do so. Meanwhile please care to have a look at this: http://search.twitter.com/search?q=%22cant+dm%22 There are a few people each hour, not being able to DM someone.