Yes, we do offer the ability to import posts from within the last 7 days from Twitter and Instagram onto your wall. To use this, just log into your account and click on your wall, and then click on Posts in the left menu. On the right side of the page, you'll see a button with the dots on it, and if you click on it, you'll see an "Import Posts..." link. Click on that and you'll be taken to our import posts tool.
The import posts tool can be used just like Twitter search to locate any posts that you want to import. For instagram you can enter a single hashtag or an @account and import posts that way, too.