Fast pre-boot

If your pre-boot (when you can choose among different SO) is too slow, you can reduce the time before the start of boot, modifying the file grub (in /etc/default), adding a line like this:

GRUB_RECORDFAIL_TIMEOUT=1

Indeed GRUB_TIMEOUT=0 could not work.

Connecting a wordpress category to a facebook page

IFTT is a good app, but with a free plan you can connect only one wordpress category to one facebook page.

There are many plugins and many web services, such as Zapier, or Activepieces, that can connect wordpress with a facebook page, but if you have a free wordpress plan (with an address like yourdomain.wordpress.com) you can install plugins only upgrading your plan.