Within Rival IQ, metrics relating to reach and impressions are considered private data by each of the social channels. If you or someone on your team manages a Facebook, Instagram, Twitter, or LinkedIn page, you can find this in Social Analytics -> Private data. To see this data, you must connect your team's accounts to Rival IQ.
Reach is a measure of unique impressions. Though the specifics vary by platform, we generally have data for reach on a per-post basis and for profiles on a per-day basis. However, the platforms do not provide us a mechanism to compute reach across an arbitrary set of posts/days.
Without this capability, we're not able to compute a unique reach number for you across an arbitrary period of time. Simply adding up reach numbers isn't a valid technique, as you'll almost certainly be double-counting any user that sees multiple posts or across multiple days.
To help your team understand your change in reach over time, Rival IQ offers average reach metrics on a per-post or per-day basis.
Impressions are a measure of the total number of times users have viewed your posts or profile, and this measure doesn't consider uniqueness across people. For example, a single user viewing your most recent post 5 times throughout a day will generate 5 impressions but only a reach of 1.
If your team needs to understand the total number of views a post or page received during a specific time period, impressions, not reach, will be the only valid choice of metric. Unlike reach, impressions can be aggregated as we aren't constrained by the uniqueness constraint of reach metrics.