I noticed an odd pattern in the Hebrew Wikipedia: some visual edits add a <noscript> tag towards the end of the article's wiki syntax code, and inside the tag there's a URL to Facebook. Most of these edits are mobile, but at least one is a usual desktop VE edit.
I only found it in the Hebrew Wikipedia. I tried some other languages—English, French, German, Czech—and I couldn't find anything like that. It might be something special to Hebrew or to Israeli people, and I'm not sure what it could be. Input from CCed Israelis is welcome :)
Examples:
- not mobile: https://he.wikipedia.org/w/index.php?title=%D7%A1%D7%A4%D7%99%D7%A8%D7%94_(%D7%A7%D7%91%D7%9C%D7%94)&diff=19049137&oldid=19049113
- mobile: https://he.wikipedia.org/w/index.php?title=%D7%99%D7%A9%D7%99%D7%91%D7%95%D7%AA_%D7%94%D7%A7%D7%95&type=revision&diff=18920667&oldid=18919856
- mobile: https://he.wikipedia.org/w/index.php?title=%D7%94%D7%A4%D7%9C%D7%A1_%28%D7%99%D7%95%D7%9E%D7%95%D7%9F%29&type=revision&diff=19012349&oldid=18737067
- mobile: https://he.wikipedia.org/w/index.php?title=%D7%A8%D7%91%D7%91%D7%94&diff=18787041&oldid=18671158
- mobile: https://he.wikipedia.org/w/index.php?title=%D7%A8%D7%91%D7%91%D7%94&diff=18787056&oldid=18787041
- mobile: https://he.wikipedia.org/w/index.php?title=%D7%9E%D7%99%D7%9B%D7%90%D7%9C_%D7%9B%D7%A5&type=revision&diff=19048049&oldid=18385105
- mobile: https://he.wikipedia.org/w/index.php?title=%D7%A2%D7%95%D7%91%D7%93%D7%99%D7%9F_%D7%93%D7%97%D7%95%D7%9C&type=revision&diff=18596758&oldid=17610430