Watermark is a searchable archive of tweets and App.net posts. It downloads tweets from everyone you are following, so you can go back and find older tweets later. And it provides a backup of all your own tweets and favorites forever. Watermark Mobile is a streamlined search interface for this archive.

Note: This app requires a subscription. You can sign up inside the app for $3.99/month. Your iTunes Account will be charged for the first month after confirmation, and then your subscription will automatically renew each month. If you chose to stop using Watermark, please cancel your subscription in iTunes at least 24-hours before renewal.

Major features and cloud storage:

* Searchable archive of your tweets and tweets from your friends.
* Downloads all tweets from your timeline, without gaps.
* Every tweet from your friends is kept for at least 6 month, and your own tweets are kept forever.
* Your favorites are also included in the archive and fully searchable.

Plus additional features available in any web browser:

* Web-based timeline that remembers your reading position from Tweet Marker-compatible apps.
* Click any tweet to set its marker and sync it back to other apps.
* Saved filters to quickly switch between search results.
* Browse by date across the timeline and your own tweets.
* Copy tweets to custom named collections for yourself or to publish online.
* Sync your saved filters and collections to Dropbox.
* Add an App.net account to archive those posts.

The iOS app is free for existing Watermark customers, or sign up with a new subscription inside the app.

For the privacy policy and terms of service see: http://watermark.io/help/privacy and http://watermark.io/help/tos