[Feature]: Not only [Reddit], Could we add more: FB, Threads, Tiktok, Douyin, Weibo..

### Summary

It's more suitable for Genz content

### Is your feature request related to a problem?

I think if you can add other platform, this tool will become the hottest tool ever

### Describe the solution you'd like

Search for trending topic on multiple platform

### Describe alternatives you've considered

_No response_

### Additional Context

_No response_

The issue does not name a file, test, or existing entry point. First trace how Reddit trending topics are currently searched, then clarify which additional platforms and supported behaviors are required; done means multi-platform trending-topic search works with agreed coverage.

Written by the indexing model from the issue text.