It allows them to view your tweets and follow you whereas they wouldn't be able to do that if they remained blocked.
unblock o.com from my RR email
yes you can. go to your blocked list and press unblock next to the person you want to unblock.
If you want to unblock someone you highlight their name by clicking it once and then you click on buddies at the top of your computer and click unblock so and so.
how
by locking
You cant
franc e
To unblock someone on AIM, sign into your account. In the contact category, use the drop down-arrow to select the category that the person you want to unblock is in. Right click on the person's name and choose Unblock.
You can try following three methods.Use a Proxy WebsiteAccess via a VPN Softwaresometime school/college block the words (facebook, twitter) so you can use them by their IP address (Twitter IP: 199.59.149.230)
unlock yahoo.com
you tell them what you what a lot
You can't it's not possible