Stamp collection is essentially a daily login bonus, generally with
better rewards as more "stamps" are collected. So far, all stamp
collections have had 10 stamps available but run a bit longer than 10
days, meaning you do not have to have 10 consecutive login days to
achieve all stamps. Stamp bonuses have included gold, ally points,
summons (including Dark Summons and special summons), elixirs, energy
and battle point potions and unique monsters.
See: List of Stamp Collections
Social Media Bonus
There are several variations seen in Dark Summoner's Social Media
Bonuses. Simply "connecting" Dark Summoner to Twitter, OpenFeint and
Facebook give additional daily bonus summons. Also, Twittering a message
to view the game's trailer sometimes gives daily bonuses outside the
login bonus, and has included Soul Point and Ally Point bonuses.
Dark Summoner has previously had collection missions which were
comprised of collecting Orbs, which were randomly awarded for doing
regular missions (only uncompleted missions, to keep high-level players
from farming 1-energy missions hundreds of times in a row). There were
several tiers of award for this, including unique summons, ally point
and gold bonuses, and various potions.
Dark Summoner continually hosts special missions. These missions can
be very straightforward (Tower style events), where the point is to
complete as many floors as possible, or a more interesting event such as
a battle tournament with special rules. These events are separated by a
gap of 1 day, and last between 1 to 2 weeks.