Use of the social network has attracted much criticism from football bosses for the lack of privacy, while charges have followed from misuse of the site.
Walker tweeted: "Morning - Thanks for all your support on my twitter break I've read it and glad to be back on Twitter - getting ready for the weekend#COYS".
Meanwhile, Norwich defender Elliot Bennett revealed that Holt has returned, saying: "Big news for all you football fans. The skipper @grantholt31 is now back on twitter by popular demand! He wishes. Welcome back mate".