This is pointed to the Web Application members that review first posts and participated on tag cleaning efforts.
When a tag used on a single question reach certain age it is automatically deleted and replaced by untagged. From time to time someone replaces this tag by a new tag but it later is deleted that deleted the previous tag.
My suggestion is that instead of creating a new tag for a web application that we aren't sure that there are Web Applications members that might answer that question, add and already exising "generic" tag like those listed below. (below of them is the current tag's excerpt)
Where people connect or talk via real-time text or video messaging
Content Management Systems allow people to update a site without the need for programming knowledge
Customer Relationship Management - a widely implemented strategy for managing a company’s interactions with customers, clients and sales prospects
A tool designed to search for information on the World Wide Web and FTP servers.
When we reach concensus on this the next step could be to analyse what is happening with the above tags, one by one. In the mean time, if you decide to create a new tag add to it the usage guidelines (tag excerpt)