change atom feed to excerpt

The atom RSS feed is full post plus excerpt. I prefer reading full posts in my feed so I don’t limit it. I also use IFTTT to crosspost to fb. Before, it only allowed the entry title, URL and image. Now it allows entry content. I want to change the atom feed so fb shows title, URL, excerpt and image.

A post from 2005 from LMT saves the day.

Find the following code in your Atom Index:

<$MTEntryBody encode_xml="1"$> <$MTEntryMore encode_xml="1"$>

Delete the $MTEntryMore line for just main body, not extended. Replace with both lines with

<$MTEntryExcerpt encode_xml="1"$>

for excerpt. Actually, just insert the entryexcerpt field from the dropdown. It works. Now I have to worry about writing good excerpts as opposed to copying the title.