If in doubt, my advice is to wait until the couple have shared the first official photos of their wedding online before sharing your own." Do I call the bride 'Ms' or 'Mrs'? One survey of Facebook users found that a third of married women in their 20s now keep their ­maiden name."Most of my brides still change their name," says wedding planner Judy Mullins of ­IDo Weddings

Although cash is still the most popular wedding gift, almost a third of guests think it's too impersonal, and plump for a pressie.

"Many guests are going back to giving a gift rather than cash as they like the idea of giving the couple something they can cherish for years to come," says a spokesperson for The Wedding Shop at Brown Thomas.

"In Ireland, many guests find it offensive to be asked to contribute financially to a wedding in lieu of gifting a traditional wedding present," says Keith Malone of Mrs2of the controversial new online trend.

"Couples are less likely to offend if they set up a 'honeymoon fund'. Younger guests generally give cash anyway." Is it OK to wear white to the wedding?

"If, for some reason, guests cannot attend at the last minute, they may not want to bother the couple, but should at least contact the venue so they can alter the seating plan accordingly." Should I bring my selfie stick or leave it at home?

While some social media-conscious couples are going so far as to hashtag their nuptials, others are banning Facebook and Twitter on their big day altogether.

"Although most couples would be happy to discover a few snaps of their big day on Facebook the next day, some may be disappointed that they didn't get to share them first," says Sophie Pigott of Weddings

"We've certainly seen a rise in 'unplugged weddings' ­recently - often flagged on the invitation or even in the mass booklet.

"The most common items asked for include coffee machines, Kitchen Aid appliances and Waterford Crystal." Cash is still king when it comes to wedding gifts, with 40pc of guests gifting between €100-€150, according to the latest figures, and up to 32pc splashing up to €200 on the happy couple. "We would estimate the typical wedding gift to be around €200 per couple and over €100 for a single person," says One Fab co-founder Naoise Mc Nally.