join by invite site

There are several popular websites and platforms that allow users to join by invitation only. These sites often focus on creating exclusive communities or offering specialized services. Here are a few examples:

**Clubhouse**: This audio-based social networking app initially required users to join via an invitation. It allows users to participate in various live discussions.

**Ello**: Originally marketed as a social network for artists, Ello started as an invite-only platform but has since opened up to the public.

**Dribbble**: This platform for designers once operated on an invite-only basis for users to showcase their portfolios but has since made it more accessible.

**Grouper**: A social networking service that organizes group meetings for singles; it often uses an invitation system.

**Airtable**: Early access to some features or beta versions was sometimes offered through invite-only access.

Please note that the status of these platforms may change, and some may have transitioned to more open access since their initial launch. Be sure to check their current policies for accessing their services! If you're looking for something specific or a particular type of community, please provide more details!