2016-08-27: Greptweet service is suspended because we store tweets. Specifically we violate Twitter's terms of I.B.3 & I.B.6.
As developer of this service, it seems too complex to implement a service to handle deletions. Basically the guideline is to not store tweets PERIOD and I do not accept that. I began greptweet for two reasons, to search my own tweets (Twitter still makes this difficult to do) and to backup my own tweets. I am not deleting my backups.
I don't have time to deal with this, so I am suspending the service. I suggest you download your backup if you used the service like I did.