By default, Tweet Marker support is disabled in both the Mac and iOS versions of Twitterrific--according to Hockenberry, The Iconfactory was worried that if it were turned on by default the volume might overwhelm the fledgling Tweet Marks servers. To activate the feature on the Mac, visit the General section of the app's Preferences; on iOS go to Settings -> Twitterrific.

Reece acknowledged that scalability is one of the big problems confronting Tweet Marker. While he would've "preferred a larger company with more resources" build out the service, that wasn't in the cards--so Reece built it himself and is using Amazon EC2 to host it. "Although the volume of tweets is huge, for Tweet Marker we are talking about tiny bits of data, so it doesn't have the storage or bandwidth requirements that other services like image hosting might have."

Still, while hosting may be cheap, it isn't without its costs--and Tweet Marker is a free service. , Reece wrote that the basic functionality of Tweet Marker would remain free, but he would consider offering advanced features to developers for a fee.

"For example, how great would it be for tweet drafts to sync across multiple clients?" Reece told . "I also believe there are usage statistics that I can provide to developers to give them a better idea of which platforms and versions are being used, so I hope to use those as an incentive to help support the service."

Still, such features are still over the horizon. "The first step," Reece said, "is making sure the initial Tweet Marker launch is successful."