Matt Slocum / ap When Leighann Bacher first started a Facebook group to help Pittsburghers find COVID-19 vaccine appointments, she and the other administrators were overwhelmed. Bacher was personally signing up a dozen or more strangers a night. Now she’s searching for people to help. When she posts information about available appointments to the group’s more than 40,000 members, the once busy comment section is radio silent. “It’s just like …crickets,” she said. Bacher said the steep drop in demand hasn’t been improved by the state moving into phase 1B, which was estimated to add as many as 1 million more Pennsylvanians into the eligibility pool.